Electronic Pressure Regulator (Epr) Replacement; Regulator Replacement; Coolant Hose Replacement; Vapor Hose Replacement - JLG 660SJ Service And Maintenance Manual

Electronic Pressure Regulator (EPR) Replacement

REMOVAL
Refer to Figure 3-95. GM 3.0 Dual Fuel System Components.
1. Unplug EPR (102) electrical connector.
2. Remove hoses from EPR.
3. Remove four flange nuts (107) and EPR from Mixer (104).
4. If new EPR is being installed, remove and retain hose
adapter (103) and four bolts (105).
INSTALLATION
1. If new EPR is being installed, install adapter (103) and
four bolts (105) to EPR.
2. Install EPR (102) on Mixer (104). Secure with four flange
nuts (107).
3. Reattach all hoses.
4. Start engine and leak check all fittings and connections.

Regulator Replacement

Refer to Figure 3-95. GM 3.0 Dual Fuel System Components.
REMOVAL
1. Disconnect and remove Lock-Off Valve (12) from Regula-
tor (16).
2. Remove hoses from regulator.
3. Remove regulator from engine.
INSTALLATION
1. Install Regulator (16) on engine.
2. Install hoses on regulator.
3. Install Lock-Off Valve (12) to Regulator. Reconnect Lock-
Off Valve.
4. Start engine and leak check all fittings and connections.
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SECTION 3 - CHASSIS & TURNTABLE

Coolant Hose Replacement

REMOVAL
1. Drain coolant.
2. Using hose clamp pliers, disconnect both hose clamps
on each hose.
3. Remove hose from fittings.
INSTALLATION
NOTE: Use hose material and lengths specified by JLG.
1. Install hose clamps to each hose and set clamp back on
each hose to make installation easier.
2. Fit hose to fittings.
3. Secure by positioning each of the clamps.

Vapor Hose Replacement

REMOVAL
1. Disconnect both hose clamps using hose clamp pliers.
2. Remove vapor hose from each fitting.
INSTALLATION
VAPOR SUPPLY HOSE IS SPECIFICALLY DESIGNED FOR THIS EQUIPMENT. DO
NOT USE HOSE MATERIAL OR LENGTH OTHER THAN JLG SPECIFIED PARTS.
1. Install hose clamps and set back on each hose.
2. Reinstall vapor hose to each fitting.
3. Reset clamps.
4. Start engine and check for leaks.
– JLG Lift – 3-89